Luminous dial



March 26,1940. G; B. WILLIAMS 2,194,627`

lLUMINoUs DIA'L Filed'Jne 5, 1939 INVENTDR. Er. B.. WILLIAMEL ATTE) FKNEYS rll Patented Mar. 1940 LUMINoUs DIAL George Bertrand Williams, Toronto, Ontario,

Canada Application `June 5, 1939, Serial No. 277,421

4 Claims.

My invention relates toimprovements in dials such as Watch, telephone dials and other indicating surfaces, and the` object of the invention is to provide a luminous dial which will not change colour or fade and the life of which is therefore extended almost indenitely and it` consists of a base provided with a vitreous surface, and luminous vitr-eous enamel applied to such vitreous surface and fused thereto and containing radio active material.

Fig. 1 is an edge View of my luminous dial.r

Fig. 2 is an alternative form of my luminous dial.

In the drawing like characters of reference indicate corresponding parts in the different views.

Referring to Fig. 1, i is a dial base formed of vitreous material or glass.' 2 is a layer of lumi-` nous vitreous material in` which is incorporated radio active material and which is applied to the surface of the base preferably by spraying. The base and layer are then fused together by any suitable means.

Referring to Fig. 2, 3 is the metal base of the dial to which is applied preferably two layers d and 5 of white vitreous enamel over which is placed, preferablytwo layers Band 'l of luminous enamel containing radio active material. The layers are fused on separately layer by layer.

If desired the metal may be provided with a bonding layer consisting of vitreous enamel applied directly to the base and fused thereto and to which white vitreous enamel is applied and fused, and over the layer of white vitreous` enamel a layer of luminous vitreous enamel containing radio active material is applied and fused.

On the completed dial may be inscribed any desired indicating characters or decorations or an `opaque background may be applied to the face of the dial and so treated as to leave exposed those luminous parts of the dial forming the indicating v characters of the dial.

` Whole being `fused together.

4. A dial comprising a metal base, a bonding layer applied tothe aforesaid base andfused thereto, a layer of White vitreous enamel applied to the bonding layer and fused thereto and a layer of luminous vitreous enamel containing radio active material applied to the White enamel layer and fused thereto. Y

GEORGE' BERTRAND WnLrAMs. 

